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Article

Genome-Wide Identification of Metal Tolerance Protein Genes in Populus trichocarpa and Their Roles in Response to Various Heavy Metal Stresses

School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
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These authors contributed equally to this work.
Int. J. Mol. Sci. 2020, 21(5), 1680; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms21051680
Received: 8 February 2020 / Revised: 26 February 2020 / Accepted: 27 February 2020 / Published: 29 February 2020
(This article belongs to the Special Issue Ion Transport and Homeostasis in Plants)
Metal tolerance proteins (MTPs) are plant divalent cation transporters that play important roles in plant metal tolerance and homeostasis. Poplar is an ideal candidate for the phytoremediation of heavy metals because of its numerous beneficial attributes. However, the definitive phylogeny and heavy metal transport mechanisms of the MTP family in poplar remain unknown. Here, 22 MTP genes in P. trichocarpa were identified and classified into three major clusters and seven groups according to phylogenetic relationships. An evolutionary analysis suggested that PtrMTP genes had undergone gene expansion through tandem or segmental duplication events. Moreover, all PtrMTPs were predicted to localize in the vacuole and/or cell membrane, and contained typical structural features of the MTP family, cation efflux domain. The temporal and spatial expression pattern analysis results indicated the involvement of PtrMTP genes in poplar developmental control. Under heavy metal stress, most of PtrMTP genes were induced by at least two metal ions in roots, stems or leaves. In addition, PtrMTP8.1, PtrMTP9 and PtrMTP10.4 displayed the ability of Mn transport in yeast cells, and PtrMTP6 could transport Co, Fe and Mn. These findings will provide an important foundation to elucidate the biological functions of PtrMTP genes, and especially their role in regulating heavy metal tolerance in poplar. View Full-Text
Keywords: heavy metal; metal tolerance protein; Populus trichocarpa; evolution; gene expression heavy metal; metal tolerance protein; Populus trichocarpa; evolution; gene expression
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MDPI and ACS Style

Gao, Y.; Yang, F.; Liu, J.; Xie, W.; Zhang, L.; Chen, Z.; Peng, Z.; Ou, Y.; Yao, Y. Genome-Wide Identification of Metal Tolerance Protein Genes in Populus trichocarpa and Their Roles in Response to Various Heavy Metal Stresses. Int. J. Mol. Sci. 2020, 21, 1680. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms21051680

AMA Style

Gao Y, Yang F, Liu J, Xie W, Zhang L, Chen Z, Peng Z, Ou Y, Yao Y. Genome-Wide Identification of Metal Tolerance Protein Genes in Populus trichocarpa and Their Roles in Response to Various Heavy Metal Stresses. International Journal of Molecular Sciences. 2020; 21(5):1680. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms21051680

Chicago/Turabian Style

Gao, Yongfeng, Fengming Yang, Jikai Liu, Wang Xie, Lin Zhang, Zihao Chen, Zhuoxi Peng, Yongbin Ou, and Yinan Yao. 2020. "Genome-Wide Identification of Metal Tolerance Protein Genes in Populus trichocarpa and Their Roles in Response to Various Heavy Metal Stresses" International Journal of Molecular Sciences 21, no. 5: 1680. https://0-doi-org.brum.beds.ac.uk/10.3390/ijms21051680

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